Kjærandsen (2009) defined this species group where the species are mainly characterized by having mesoscutum covered with short but comparatively stout setae, often with a single pair of distinct bristles posteriorly (Kjærandsen 1994), by having smaller and more narrow wings with relatively larger microtrichia, and by a number of characters in the male terminalia such as: dorsal branch of gonostylus usually extremely prolonged caudally (Fig. 1), dorsointernal branch being sclerotized, bi-furcated and without lamellae, ventral branch forming thin, enlarged plate bearing more than five strong, characteristically fan-tipped setae ventrally, and pseudocerci always bearing some strong bristles apically. The female terminalia has fused, slender, s-shaped cercus, and a long and slender, but sclerotized postgenital plate. The longistylus-group is confined to the Afrotropical Region and the included species are: P. camerounensis, P. lanceostylusand P. longistylus (Fig. 1). The four unassociated Afrotropical species described from female holotypes may also belong to this group: P. edwardsiana, P. hancocki, P. silhouettensis and P. tanganyikae.